*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
.clearfix:after,
.clearfix:before{
    display: block;
    content: "";
    clear: both;
}
.tao{
    width: 400px;
    margin: auto;
}
li{
    list-style: none;
}
a{
    text-decoration: none;
}
.nav li{
    float: left;
    padding: 10px 15px;
}
.an1,.an2{
    float: left;
}
.nav a{
    color: #000;
}
.nav .active a{
    display: block;
    color: #ea4d00;
    border-bottom: 2px #ea4d00 solid;
}
.main a{
    color: #000;
    font-size: 14px;
}
.an1{
    padding-right: 10px;
}
.main > div{
    display: none;
}
.main > div.active{
    display: block;
}